SINEDY Safe Hidden Hide Security Rock Stone Case Box Great for flower pots, rock gardens, front porches, or wherever you'd like to safely and secretly store a spare key. This plaster composite rock looks and feels real. Realistic looking rock that contains a secret compartment just right for hiding a key. Looks just like an ordinary rock but allows you to hide several keys inside it. You will never have to worry about being locked out again. Material:Synthetic resin. Size:9cm x 5.7cm x 4.5cm - 3.54inch x 2.24inch x 1.77inch.